Climatological Report (Monthly)
Issued by NWS Caribou, ME

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CXUS51 KCAR 021850
CLMCAR

CLIMATE REPORT
NATIONAL WEATHER SERVICE CARIBOU ME
249 PM EDT SAT SEP 02 2023

...................................

...THE CARIBOU ME CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             95   08/02/1975
                       08/16/1944
                       08/14/1944
 LOW              34   08/25/2003
                       08/31/2002
                       08/30/1982
HIGHEST           78   08/10         MM      MM       89  08/07
LOWEST            45   08/23         MM      MM       43  08/28
                       08/28
AVG. MAXIMUM    71.9               75.7    -3.8     76.6
AVG. MINIMUM    54.5               54.1     0.4     55.9
MEAN            63.2               64.9    -1.7     66.3
DAYS MAX >= 90     0                0.5    -0.5        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       12.09   1981
 MINIMUM        0.93   1957
TOTALS          6.60                       2.99
DAILY AVG.      0.21               0.12    0.09     0.12
DAYS >= .01       13               13.0     0.0       14
DAYS >= .10        9                7.5     1.5       10
DAYS >= .50        6                2.5     3.5        3
DAYS >= 1.00       1                0.6     0.4        0
GREATEST
 24 HR. TOTAL   1.91   08/30 TO 08/30               1.11  08/08 TO 08/09

SNOWFALL (INCHES)
RECORDS
 TOTAL           0.0   MM
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        0.0                0.0     0.0       MM
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                   0  MM
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL     72                 71       1       38
 SINCE 7/1        79                113     -34       MM
COOLING TOTAL     23                 68     -45       84
 SINCE 1/1       304                207      97       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.7
HIGHEST WIND SPEED/DIRECTION    22/340    DATE  08/31
HIGHEST GUST SPEED/DIRECTION    36/330    DATE  08/31

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.59
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY          9

AVERAGE RH (PERCENT)     77

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                6     RAIN                      10
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      18     FOG W/VIS <= 1/4 MILE      4
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
*  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.
---------------------------------------------------------------------

...NORTHERN/EASTERN MAINE AUGUST 2023 CLIMATE MONTHLY SUMMARY...

AUGUST 2023 WILL BE REMEMBERED FOR COOLER THAN AVERAGE TEMPERATURES
AND WELL ABOVE AVERAGE RAINFALL.

AFTER THE WARMEST JULY ON RECORD IN CARIBOU AND A TOP 4 WARMEST JULY
ON RECORD AT THE OTHER LONG TERM CLIMATE SITES, AUGUST WAS MUCH
COOLER ACROSS THE REGION WITH TEMPERATURES THAT AVERAGED FROM 1 TO
2.5 DEGREES BELOW AVERAGE.

IN CARIBOU, THERE WERE NO 80 DEGREE DAYS THE ENTIRE MONTH.  THE ONLY
OTHER TIME THIS HAS OCCURRED SINCE WEATHER RECORDS BEGAN IN 1939 WAS
BACK IN 1972.  ON AVERAGE, CARIBOU OBSERVES 8 DAYS WITH A HIGH OF
80F OR WARMER DURING THE MONTH OF AUGUST.  IN BANGOR THERE WERE 7
DAYS WITH A HIGH OF 80F OR WARMER, AND THE HIGHEST TEMPERATURE ALL
MONTH WAS 84F. TYPICALLY BANGOR OBSERVES 16 DAYS DURING THE MONTH OF
AUGUST WITH A HIGH OF 80F OR WARMER.

RAINFALL ACROSS THE REGION THIS PAST AUGUST WAS WELL ABOVE AVERAGE
AND RANGED FROM 150 TO 200 PERCENT OF NORMAL, AND WAS SPREAD OUT
FAIRLY EVENLY ACROSS THE MONTH. THE AUGUST 2023 TOTAL PAN
EVAPORATION OF 2.38 INCHES AT CARIBOU WAS MUCH LESS THAN RAINFALL
ACROSS THE REGION, MEANING SOILS BECAME INCREASINGLY MOIST. THERE
WERE SOME FIELDS AT THE END OF THE MONTH THAT HAD PATCHES OF
STANDING WATER. STREAMFLOWS ACROSS MOST OF THE REGION WERE ABOVE TO
WELL ABOVE AVERAGE AT THE END OF THE MONTH.

THERE WAS LITTLE SEVERE WEATHER IN JUNE AND JULY, AND AUGUST HAD THE
MOST REPORTS OF SEVERE THUNDERSTORMS OF ANY MONTH THIS SUMMER.  ON
AUGUST 13TH THERE WERE SEVERAL SEVERE THUNDERSTORMS THAT KNOCKED
DOWN TREES AND PRODUCED LARGE HAIL IN PORTIONS OF AROOSTOOK,
PISCATAQUIS, AND PENOBSCOT COUNTIES.

THE CLIMATE PREDICTION CENTER`S OUTLOOK FOR THE MONTH OF SEPTEMBER
2023 INDICATES THAT THE ODDS ARE SLIGHTLY TILTED TOWARD ABOVE
AVERAGE TEMPERATURES. THERE ARE NO STRONG SIGNALS THAT WOULD POINT
TOWARD ABOVE OR BELOW AVERAGE PRECIPITATION. AVERAGE HIGH
TEMPERATURES ARE IN THE LOW TO MID 70S AT THE START OF THE MONTH AND
DROP TO THE LOW TO MID 60S BY THE END OF THE MONTH. AVERAGE LOWS
DROP FROM THE LOW 50S EARLY IN THE MONTH TO THE LOW 40S BY THE END
OF THE MONTH. FROST BECOMES AN INCREASING THREAT DURING THE MONTH OF
SEPTEMBER, ESPECIALLY ACROSS THE NORTHERN VALLEYS DURING THE SECOND
HALF OF THE MONTH. ALTHOUGH VERY RARE, SNOW HAS BEEN OBSERVED ACROSS
FAR NORTHERN PORTIONS OF THE REGION LATE IN THE MONTH. THE CHANCES
OF SEVERE THUNDERSTORMS DROPS OFF RAPIDLY DURING THE MONTH.
SEPTEMBER IS THE MOST LIKELY MONTH FOR THE REGION TO BE AFFECTED BY
A TROPICAL SYSTEM OR THE REMAINS OF A TROPICAL SYSTEM.

$$

CB/VJN


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